<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader @addTodo="addTodo" />
      <MyList :todoList="todoList" />
      <MyFooter
        :todoList="todoList"
        @checkAllTodo="checkAllTodo"
        @deleteAllTodo="deleteAllTodo"
      />
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js';

import MyHeader from './components/MyHeader';
import MyList from './components/MyList';
import MyFooter from './components/MyFooter';

export default {
  name: 'App',

  components: { MyHeader, MyList, MyFooter },
  data() {
    return {
      todoList: JSON.parse(localStorage.getItem('todoList')) || [],
    };
  },
  methods: {
    //往todoList里面添加元素
    addTodo(todoObj) {
      this.todoList.unshift(todoObj);
    },
    checkAllTodo(check) {
      this.todoList.forEach(todo => (todo.status = check));
    },
    deleteAllTodo() {
      this.todoList = this.todoList.filter(todo => !todo.status);
    },
    // updateTodo(id, title) {
    //   console.log('@@@@', id, title);
    //   this.todoList.forEach(todo => {
    //     if (todo.id === id) {
    //       todo.title = title;
    //     }
    //   });
    // },
  },
  mounted() {
    // 根据id删除todoList中的元素(全局时间总线写法)
    // this.$bus.$on('deleteTodo', id => {
    //   this.todoList = this.todoList.filter(todo => todo.id != id);
    // });
    //根据id删除todoList中的元素(消息订阅与发布写法)
    this.pid = pubsub.subscribe('deleteTodo', (msg, id) => {
      this.todoList = this.todoList.filter(todo => todo.id != id);
    });

    this.$bus.$on('changeStatus', id => {
      this.todoList.forEach(todo => {
        if (todo.id === id) {
          todo.status = !todo.status;
        }
      });
    });
    this.$bus.$on('updateTodo', (id, title) => {
      this.todoList.forEach(todo => {
        if (todo.id === id) {
          todo.title = title;
        }
      });
    });
    // this.$bus.$on('updateTodo', this.updateTodo);
  },
  beforeDestroy() {
    // this.$bus.$off('deleteTodo');
    pubsub.unsubscribe(this.pid);
    this.$bus.$off('changeStatus');
    this.$bus.$off('updateTodo');
  },
  watch: {
    todoList: {
      deep: true,
      handler(value) {
        localStorage.setItem('todoList', JSON.stringify(value));
      },
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-edit {
  color: #fff;
  background-color: skyblue;
  border: 1px solid #bd362f;
  margin-right: 5px;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
